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Last-minute sub for Kyle Larson finishes 16th at Martinsville Speedway Play: NASCAR Fantasy Live MARTINSVILLE, Va. -- Kyle Larson was hours away from Martinsville Speedway on Sunday afternoon, staying in a Charlotte medical facility while Regan Smith filled in as an 11th-hour substitute in the No. 42 Chevrolet he usually drives. That doesn't mean he wasn't tuned in to how his Chip Ganassi Racing outfit was doing, leading to an entertaining back-and-forth over the team radio communications during pace laps. "We know you're listening, Kyle. We're going to get one for you." "He just texted me to say 'I'm listening.' " "We can't get away with anything." With their talented driver eavesdropping the day after he fainted at an autograph session, Smith wheeled Ganassi's No. 42 to a solid 16th-place finish in the STP 500 , rallying from a mid-race spin and a last-place starting spot. Ganassi officials contacted the NASCAR XFINITY Series regular on Saturday night, shortly after Larson was transported to a local hospital for tests, to inquire about his availability. When Smith awoke at 5:30 a.m. ET, he was already tapped for substitute detail. "I definitely appreciated them calling me in that situation," Smith said. "I hate it for Kyle -- he's a friend and a competitor, so you don't ever want to see that happen. I know it probably tore him up today." On such short notice, the makeshift accommodations -- Smith was fitted using CGR teammate Jamie McMurray 's seat as a model, and he borrowed a crew member uniform for his firesuit -- took some getting used to. He was forced to drop to the rear of the field from the seventh starting position that Larson earned in Friday's Coors Light Pole Qualifying because of the driver change, making his battle an uphill one before the green flag ever unfurled. But Smith made progress, getting to the fringes of the top 10 until he spun after a nudge from Kurt Busch in the 286th of 500 laps during a traffic jam. "It was just a check-up, a chain-reaction deal and by the time it got back to me, I hit the car in front of me and whoever was behind me hit me even harder," Smith said. "It's typical Martinsville. We saw it happening all day. Sometimes it's such a big check-up that you can't do anything about it. It's just a racing deal." The contact dropped him from 17th to 27th, last on the lead lap, for the next restart, but Smith still found momentum that kept him on the leader's pace. "We just fought hard all day long, stayed on the lead lap. That was a big goal, starting where we did," Smith said. "It's tough sometimes to stay on that lead lap here. I thought the car was a little better than where we finished at the end. I got hung on the last restart on the outside and then couldn't get through some of the traffic as quick as I needed to. But nonetheless, good day for sitting at the house last night, thinking I wasn't going to be doing anything." In the span of the last 21 Sprint Cup races dating back to last August, Smith has subbed in for three teams -- the No. 14 and 41 cars from Stewart-Haas Racing and Sunday's ride in the No. 42. The effort wasn't lost on crew chief Chris Heroy, who applauded Smith's versatility in running a largely clean race at one of the sport's roughest tracks. "I was really impressed," Heroy said. "To jump in cold like that and be able to run solid in the top 15 is a real credit. We struggled from time to time with Kyle here, with Juan here, so it's a nice run for our program, and I can't say enough about what a great job he did." Heroy said he spoke to Larson on Sunday morning, saying that his evaluations were going well thus far. "He's in good spirits," Heroy said. "He's passing all his tests. He's an incredible student down there, so I'm going to go check on him right now and drive back to Charlotte." MORE: READ: Latest NASCAR news PLAY: Sign up for Fantasy Live WATCH: Latest NASCAR video FOLLOW LIVE: Get RaceView today FULL SERIES COVERAGE • Latest news • Standings • Schedule